Methods for production of metal oxide nano particles, and nano particles and preparations produced thereby
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A technology of oxide particles and oxides, applied in the preparation of oxide/hydroxide, metal/metal oxide/metal hydroxide catalyst, chromium oxide/hydrate, etc., can solve the problem of difficult to obtain particle size characteristics, control complex issues
Inactive Publication Date: 2009-01-14
朱马国际公司
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However, the control of this method is complicated, and thus it is difficult to obtain characteristics such as uniform distribution of particle size and specific particle size at the nanoscale
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[0071] The present invention will now be described in detail hereinafter.
[0072] The starting aqueous metal salt solution used in the present invention is preferably an aqueous metal salt solution comprising metal ions or complexes thereof in a concentration of at least 0.1% w / w metal.
[0073] According to a preferred embodiment, the metal w / w concentration in the starting solution (or metal salt solution) is at least 2%, more preferably at least 5%, most preferably at least 10%. There is no upper limit to the concentration of the starting solution. However, according to a preferred embodiment, the concentration is below the saturation level. According to another preferred embodiment, high viscosity is not desired. According to yet another preferred embodiment, the OH / metal ratio in the solution is less than 2. According to a preferred embodiment, the starting solution is prepared at a temperature below 70°C.
[0074] Any source of metal is suitable for preparing the st...
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Abstract
The invention provides a method for the formation of small-size metal oxide particles, comprising the steps of: a) preparing a starting aqueous solution comprising at least one of metallic ion and complexes thereof, at a concentration of at least 0.1 % w / w of the metal component; b) preparing a modifying aqueous solution having a temperature greater than 5O0C; c) contacting the modifying aqueous solution with the starting aqueous solution in a continuous mode in a mixing chamber to form a modified system; d) removing the modified system from the mixing chamber in a plug-flow mode; wherein the method is characterized in that: i) the residence time in the mixing chamber is less than about 5 minutes; and iii) there are formed particles or aggregates thereof, wherein the majority of the particles formed are between about 2nm and about 500nm in size.
Description
field of invention [0001] The present invention relates to methods of making small-sized metal oxide particles, and more particularly to methods of making metal oxide particles of desired particle size, particle size distribution and habit in an industrially and economically practical manner. In the present invention, the term metal oxide means and includes the chemical formula Metal x o y Metal oxides (such as SnO, SnO 2 、Al 2 o 3 , SiO 2 , ZnO, CoO, Co 3 o 4 、Cu 2 O, CuO, Ni 2 o 3 , NiO, MgO, Y 2 o 3 , VO, VO 2 , V 2 o 3 , V 2 o 5 , MnO, MnO 2 , CdO, ZrO 2 , PdO, PdO 2 、MoO 3 、MoO 2 、Cr 2 o 3 , CrO 3 , and RuO 2 ), the chemical formula is Metal p (OH) q o r metal oxyhydroxides (such as Sn(OH) 2 , Sn(OH) 4 , Al(OH) 3 、Si(OH) 4 , Zn(OH) 2 、Co(OH) 2 、Co(OH) 3 , CuOH, Cu(OH) 2 , Ni(OH) 3 , Ni(OH) 2 , Mg(OH) 2 , Y(OH) 3 , V(OH) 2 , V(OH) 4 , V(OH) 3 , Mn(OH) 2 Mn(OH) 4 , Cd(OH) 2 , Zr(OH) 4 , Pd(OH) 2 , Pd(OH) 4 、Mo(OH) 4 , Cr(OH)...
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